Improvement in tubes for steam-generators



mit?? @met @fina GEORGE E. VAN AMRINGE, OF NEW YORK, NQY.,

Letters Patent No. 85,149, dated Decembm 22, 1868.4

The Schedule referred to in mese Letters Patent and'making part of thesame.

To all whom it lma/y comic/ru:

Be it known that l, GEORGE E. VAN AMnrseE, of the city, county, andState of New` York, have invented a. new4 and useful Improvement in theTubes or Flues of Steam-Boilers; and I do hereby declare that thefollowing is a full, clear, and exact description thereof, which willenable others skilled in the art to make and use the same, referencebeing had to the accoiripanyinf'if` drawings, forming part of thisspecification.

Figure l is a side View, partly in section, of a portion of asteam-boiler flue, illustrating my invention.

Figure -2 illustrates a modification of the same.

Similar letters of reference indicate corresponding parts.

Myinvention has for its .object to improve the construction of thetubes'of steam-boilers so as to economize the heat, or, in other words,to obtain a greater practical effect from the same amount of fuel thanwhen the tubes are constructed in the ordinary manner; and

It consistsv in the construction of the tubes in vone piece, with spiralor transverse corrugations extending wholly. or partially around saidtubes, as hereinafter more fully described.

A representsv a tube of a steam-generator, which is corrugated spirally,as shown in' fig. 1.

The corrugations a may extend entirely around the tube, as shown in g.l, or they maybe formed onlyv npo n the upper part of said tube, asshown in red in fig.2. The corrugations a" may be formed at any desiredangle with the axis of the tube, or they may be frmed'at right anglesvwith said axis.

By this construction, as the ame,'smoke, and other i products ofcombustion passthrough the tube A, they impinge upontheinwardly-projecting surfaces, of the corrugations a', and receive awaving or swirling mo-- tion, the eect of which is to cause all theparticles of said productsl of combustion` tocome into immediate andfrequent contact with the inner surface of the tube;

A, so that a`much larger amount of heat is abstractedfrom said productsof combustion, and communicated to the water surrounding the tube, thusproducing a much greater practical effect than is possible when theproducts of combustion pass through a smooth, straight tube,..oronercorrugated longitudinally, or parallel with the axis oi' saidtube.

It should be' observed that when the products of combustion pass throughthe tube A, theyimpi'nge upon the inwardly-projecting surfaces of thecorrugay 4 tions a', but when the products of combustion pass along theouter surface of the tubes, they impinge upon the outwardly-proj ectingsurfaces of the said corl rugations, so that, in every case, theproducts of combustiQn are thrown into awaving or swirling movement, andthe greatest possible amount of heat is abstracted from them. y

This invention is equally applicable to all varieties of tubularsteam-boilers, whether they may be the small tubes oflocomotive-boilers, or the large tubes of marine boilers, and with equaladvantage.

I 'am aware of the patents granted to B. J. Miller, jApril 5, 1838,Richard Montgomery, October 29, 1850, and lVIarch'lQ, 1867, and to JamesH. Sturdy, January l5, 1867, and I do not, therefore, claim 'what istherein claimed; but, havingthus described my invention,

What I claim as new, and desire to secure by `Letters Patent, is- A YlLlhe construction of the tubes of steam-generators, being composed ofone piece, substantially as herein set forth. v

The above specification of my invention signed by me, this 21st day ofAugust, 1868.

. G. E. VAN AMRINGE. Witnesses: f

J AMES T. Gramm O. L.' ToPLIFF.

